Russian and Turkish jets have carried out joint air raids against ISIL fighters in the town Al Bab in northern Syria, according to Russia's military.

Lieutenant-General Sergei Rudskoi, a senior defence ministry official, said on Wednesday that nine Russian and eight Turkish fighter jets had together struck targets in the town, located 25 miles northeast of Aleppo.

"Today the Russian and Turkish air forces are conducting their first joint air operation to strike [ISIL] in the suburbs of al-Bab," Rudskoi said.

"The assessment of the initial results ... showed the strikes were highly effective," he added.

The joint operation, the closest cooperation between the two countries in Syria to date, marks a dramatic warming of ties between Ankara and Moscow, once strained by the shooting down of a Russian jet by a Turkish warplane in 2015.

The two countries have backed opposing sides in the nearly six-year Syrian conflict, but are now the main organisers of a new round of peace talks due to take place in Kazakhstan on January 23.

They have set aside their differences over the political fate of President Bashar al-Assad to try to forge a wider Syria deal.

US involvement

Separately, US-led coalition jets also struck ISIL positions in Al Bab on Tuesday and Wednesday, according to coaliton spokesman Colonel John Dorrian.

"These strikes were the result of continued cooperation with Turkey, and we saw a window of opportunity where it was in our mutual interests to get those targets destroyed," Dorrian said.

Turkey has previously criticised the US for not helping it in its attempts to capture the area from ISIL, which stands for Islamic State of Iraq and the Levant.

Earlier this month, Mevlut Cavasoglu, the Turkish foreign minister, had hinted about cutting off US access to the Incirlik air base, in southeastern Turkey, if it did not support its fight against ISIL, also known as ISIS

Ankara launched an anti-ISIL push in northern Syria in August after the group carried out multiple attacks targeting civilians security forces across the country.

A number of forces, often rivals themselves, are fighting ISIL in Syria and neighbouring Iraq.

In Iraq, Kurdish and Iraqi forces - backed by the US-led coalition - have succeeded in pushing the fighters out of most of the major cities it once held, but are facing stiff resistance in Mosul, the group's last urban stronghold in the country.

In Syria, the group managed to wrest the historic city of Palmyra from Syrian government control in December and this week made gains in the eastern city of Deir Az Zor.

ISIL captured most of the territory it now holds in Syria and Iraq after a series of rapid offensives starting in early 2014.